Endless band grinding and polishing machine



May 22, 1928. 1,670,943

7 R. C. TURNER ENDLESS BAND GRINDING AND POLISHING MACHINE Filed 061;. 28, 1924 2 Sheets-Sheet l Illlllliiillllllllllllll finger) Czar/6.1 71'11770/ May 22, 1928. 1,670,943

- R. c. TURNER ENDLESS BAND GRINDING AND POLISHING MACHINE Filed Oct. 28, 1924 2 Sheets-Shef 2 mung.

Patented May 22, 1928..

UNITED STATES ROBERT CHARLES TURNER, or BIRMINGHAM, ENGLAND.

ENDLESS BAND GRINDING AND POLISHING MACHINE.

Application filed October 28, 1924, Serial No. 746,386 and. in Great Britain March 18, 1924.

The invention relates to a grinding and polishing machine of the type using an endless band travelling over end pulleys and over the surface of a work table disposed intermediate of the pulleys.

In a machine of this type traversing screw mechanism has been provided to adjust the position of one of the end pulleys tostretch or tension the endless band, and clamping devices to rigidly fix the adjusted position. It has also been proposed to makethe work table adjustable laterally in respect of the running to the endless band and to provide said table for total detachment from the frame of the machine.

The present invention further provides an endless band supporting and adjusting device comprising a substantially T-shap'ed frame and a bracket adj-ustably mounted on the frame. v

The invention further provides for the ready detachment of the bracket, traversing screw mechanism and clamping devices as a unit. a v

The various novel features of the invention are described in the following specification with reference to the accompanying drawings and will be particularly pointed out in the claims.

The improved machine according to the invention is'represented by the accompanying sheets of drawings.

Fig. 1 is a plan of the machine.

Fig. 2 is a front elevation of Fig.1 with the endless band removed.

Fig. 3 is a sectional plan of a portion of Fig. 1 showing how the bracket carrying the adjustable band pulley is adjustably fitted to the slide-member of the machines frame and is locked after adjustment.

Fig. 4 is a right-hand side elevation of Figs. 1 and 2.

Fig. 5 is a lefthand side elevation of Figs. 1 and 2.

Fig. 6 is a transverse sectional view taken substantially central-1y of the bracket and clamping devices ,shownin Fig. 3.

' The machine represented in the drawings is a horizontal machine, its work table being disposed in the horizontal plane, but it will be obvious that said table may be vertically disposed in a vertical machine.

The frame comprises the base a, slidemember 0 and drive shaft members d and f over which is anti-frictionally mounted a long sleeve f carrying a drive pulley f at one end and one of the band pulleys f at the other end. The anti-frictional mounting of the sleeve may conveniently be by ball bearings.

The slide-member 0 of the frameis substantially, of open box construction to accommodate a rigidly built bracket g, traversing screw devices therefor. and locking devices whereby the position of said bracket upon the slide member is rigidly clamped after adjustment to putthe' necessary te sion on the endless band.

Said bracket 9 constitutes a mounting for an adjustable endless-band pulley 72. mounted to revolve upon a shaft b whose ends are carried in bearing pieces h, it, applied to the arm extensions of-the bracket 9, the bearing piece h being pivoted to the bracket 9 by the pivoting pin it and the bearing piece It being provided with a slot k and a clamping pin it whereby this bearing piece in adjusted position upon the bracket 9 may be clamped to said bracket, the shaft 71. of this pulley being therefore capable of being set at a slight angle to the shaft f to cause the endless band, indicated at 1 Fig. 4, to have its running position over the two band pulleys f", h, changed to nearer the one side than the other.

The bracket 9 is applied to the machined facing 0 of the slide member a to traverse there-along truly to regulate the distance between the two band pulleys f, h, for the purpose of tensioning the band fl/ said traverse being carried out by said bracket 9 having as part of it a screw box g engaged by a traversing screw 11 mounted within the slide member a longitudinally to revolve only, said traversing screw being rotated from the milled head't".

The bracket 9 engages the slide-member c with tongue and groove engagements, the tongues being represented the edges of the longitudinal slot 0 of the slide-member, and the grooves correspondingly formed in the sides of the base of the bracket as indicated by the dotted lines g such tongue and groove engagements truly guiding the traverse of the bracket upon the slide-member. After the position of the bracket 9 has been adjusted upon the slidemember 0 it is rigidly clamped to said slidemember by a bolt carried by the bracket 9 passing transversely through the slidemember to be engaged by a screw nut 9' working against a clamping block 9 which abuts against the inner face of that part of the slide member in which the slot o is formed, so that by operation of the bolt and nut and clamping block the bracket 1 can be rigidly clamped to the slide member 0.

Any form of bolt clamping devices may be used for rigidly fixing the bracket 9 to the slide member 0 after the tension on the endless band y has been adjusted.

The work table 7' provides the flat working surface j over which the endless band y travels between the two band pulleys f, h.

'This table along one side of it is formed with a rigid extension 7' transversely slotted at j, P. Screw bolts g pass through these slots and into the slide member 0 to clamp the table rigidly onto said slide member, the slots allowing of the position of the table to be adjusted relative to the edge of j of said table may be either set flush with the adjacent edge of the band or inwards of it, or beyond said edge, as desired. This Work table can also be entirely and readily removed from the machine in cases where work cannot be performed with the table in posit-ion, as, for instance, in grinding or polishing spherical work.

The outer end of the slide-member c, which as before stated is substantially of open box construction, is closed by an at tached plate Z which on being detached can be removed from the slide member together with the traversing screw 11 clamping bolt 9* et cetera and bracket g, as one piece.

Having now described my invention what I claim and desire to secure by Letters Patent is -1. An endless band grinding and polishing machine comprising a substantially T-shap'ed frame structure of which the stem is of open box-like construction to form one portion of a slide member andwhose head forms a support for a drive shaft, a drive shaft rotatable in said su'pport,'a drive pulley and an endless band pulley carried by said shaft, a bracket mountedto slide longitudinally of said slide member and carrying the other portion of the slide member, a second endless band pulley rotatably mounted on said bracket, an adjusting screw extending longitudinally of the slide member and engaging said bracket for adjusting the latter longitudinally of said slide member, and

clamping means extending transversely of i said slide member and engaging said bracket to lock the latter in adjusted position.

2. An endless band grinding and polishing machine comprising a base member, a slide memberintegral with said base member and having arms extending laterally from one of its ends, each of said arms having a right-angled extension, a driveshaft rotatably supported between said extensions, a drive pulley and an endless band pulley carried by said shaft, a bracket supported by and slidable longitudinally of said slide member, a second endless band pulley rota-t ably mounted on said bracket in alinement with said first-named endless band pulley, and means carried bodily by the bracket for angularly adjustingsaid lastnamed pulley on said bracket.

3. An endless band grinding and polishing machine comprising a slide member of open box-like construction, a drive pulley and an endless band pulley rotatably supported at one end of said slide member, a bracket havingtongue and groove connection with said slide member for adjustment longitudinally of the latter, a second pulley rotatably mounted on said bracket, an adjusting screw extending longitudinally of I said slide member and having threadedenthe endless band 3 so that the outer edge gagement with said bracket for adjusting the latter longitudinally of the slide member, clamping means extending transversely of said slide member and engaging said bracket for securing the latter inadjusted position, and a plate detachably mounted on said slide member forming a closure for one end thereof and supporting said adjusting screw whereby said bracket, adjusting screw and clamping means may be detached as a unit from said slide member.

4. An endless band grinding and polish ing machine comprising a slide member, a pulley rigidly supported for rotation at one end of said slide member, a second pulley rotatably supported at the other end of said slide member and adjustable toward and away from said first-named pulleyand a table resting on said slide member and adjustable transversely of the latter, said pub leys adapted to carry a movable grinding and polishing belt across said table.

5. An endless band abrasive machine, ineluding a base, a T-shaped frame mounted horizontally on said base, the terminals of the head of the T being provided, with alined bearings, a combined drive pulley and band pulley journaled in said bearings, a bracket having two extensions, cooperative means carried by the frame and the bracket for adjustably connecting the bracket to the frame, two bearings adjustably connected to the two extensions of the bracket, and a band pulley journaled in said bearings and capable of being alined or placed at an angular position relatively to the first pulley, and an abrasive band mounted upon both pulleys.

6. An endless band abrasive machine, including a base, a T-shaped frame mounted horizontally on said base, the terminals of the head of the T being provided with alined bearings, a combined drive pulley and band pulley journaled in said bearings, a bracket having two extensions, said bracket being provided with a projection and the frame being provided With a slot for slidably receiving said projection, a screw for imparting sliding movement to the bracket, a. locking screw for locking the bracket in adjusted position, two bearings adjustably connected to the tWo extensions of the bracket a band pulley journaled in said bearings and capable of being alined or placed at an angle relatively to the first pulley, and an abrasive band mounted upon said pulleys.

In testimony whereof I have hereunto set my hand.

ROBERT CHARLES TURNER. 

